Adding a fuel transfer tank

[Whirlwind]

I am thinking about adding a diesel fuel transfer tank to my 2008 f450. I have been looking at a 90 gallon diamond aluminum tank with a tool box storage compartment on top. I know they make a 60 gallon one but the tool box is pretty shallow compared to the 90' and the 90 is only 50 bucks more. It has a 12-volt pump with a button mounted in the dash that you press to fill your stock tank manually when you want to add fuel to it. Fills thru the filler neck.My question is has anyone added this to their rig and if so what are your comments? I priced it locally at a pickup accessory store today,with installation it came to $1200.00. Some on the internet are priced near $2000.00. Any comments would be appreciated.